| Abbreviation | Definition |
|---|---|
| AACG | American Association of Crystal Growth |
| AACI | American Association of Crop Insurers |
| AACL | American Association of Corpus Linguistics |
| AACN | American Association of Colleges of Nursing |
| AACN | Association Alliance of Collegiate Nursing |
| AACO | American Association of Certified Orthoptists |
| AACO | Apartment Association of Central Oklahoma |
| AACP | American Association of Colleges of Pharmacy |
| AACP | American Association of Community Psychiatrists |
| AACP | Arkansas Association of Chiefs of Police |
| AACP | Association of Adventist Camp Professionals |
| AACP | Association of Ahmadi Computer Professionals |
| AACP | Association of Air Conditioning Professionals |
| AACR | American Association of Cancer Research |
| AACR | Arizona Association for Conflict Resolution |
| AACR | Association for the Advancement of Civil Rights |
| AACS | American Association for Chinese Studies |
| AACS | Association for Applied and Clinical Sociology |
| AACSB | Association of advanced collegiate schools of business |
| AACSS | Musician Aashish Association for Chirpy Sanctimonious Song |